Before Thursday, the top of the NBA Draft seemed pretty set. Joel Embiid would go No. 1. Andrew Wiggins and Jabari Parker, in some order, would follow at Nos. 2 and 3. Somebody else (maybe Dante Exum) could have climbed into the top three, but that didn't appear likely. For a week before the NBA Draft, the top of the board seemed downright predictable.

Executives previously worried about Embiid because of well-known back issues that kept him out of the NCAA tournament. Now add the foot issue, which can be a major problem for big men, and red flags dot his body. Obviously surgeries have advanced and every case is different, but the following tweet sends shivers down the spine:

You will hear this a lot: Yao Ming, Bill Walton and Zydrunas Ilgauskas all had navicular fractures in their feet.

I still find it difficult to believe Embiid would fall to the Boston Celtics at No. 6, but maybe it's possible. Ford tweeted that the center's range is likely three to six.

If the Celtics don't think he will, CSNNE's A. Sherrod Blakely reported they will even "give some serious thought" to trading UP to get Embiid. That sounds aggressive, maybe even crazy, but where many teams zig, Danny Ainge spots opportunity. If too many clubs pass on Embiid, Ainge might find the value of a potential franchise-changing 7-footer too high to worry about his injuries.

Obviously the Celtics are also considering other options with their pick. They have worked out a number of prospects they could choose there, they have reportedly discussed moving both up and down, and they would like to acquire Kevin Love if they can. But rumored interest in Embiid is intriguing.

After his stress fracture became public knowledge, Celtics director of player personnel Austin Ainge discussed how the club deals with injuries to draft prospects.

“Those are always concerns, especially when it’s a player like that (Embiid) that we won’t be able to have in to evaluate to really get the risks from our medical staff," Ainge said. "There’s a lot of guesswork involved, but you’re always trying to weigh short term and long term. We try to think long term that if a guy has to miss a couple months, that shouldn’t deter us from taking him if he’s going to be the best player long term.

"We’ve had some success with that with Avery (Bradley) and (Jared Sullinger) in the draft, sliding to us. Even Leon Powe slid all the way late. Unfortunately Leon’s knees gave out eventually but we got a couple good years out of him. There can be some value there but there’s always risk.”

Some team will take the risk on Embiid. We don't know which team yet, but we do know the draft just got a little crazier.